8034812: remove IDX_INIT macro hack in Node class
Summary: The IDX_INIT macro used by Node::Node(...) to retrieve the Compile object is removed and replaced by a call to Compile::current(). The Node constructor, new operator and all calls to it are adapted accordingly.
Reviewed-by: kvn, jrose, iveresov, goetz
typeof(java.lang.System.exit) = function
typeof(java.lang.System['exit']) = function
typeof(java.lang.System['exit(int)']) = function
typeof(java.security.AccessController.doPrivileged) = function
typeof(java.security.AccessController['doPrivileged']) = function
typeof(global.Object) = function
typeof(new global.Object()) = object
typeof(engineGlobal.Object) = function
typeof(new engineGlobal.Object()) = object